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LT1611 Datasheet(PDF) 11 Page - Linear Technology |
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LT1611 Datasheet(HTML) 11 Page - Linear Technology |
11 / 12 page 11 LT1611 TYPICAL APPLICATIO S Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen- tation that the interconnection of its circuits as described herein will not infringe on existing patent rights. Table 1. Inductor Vendors VENDOR PHONE URL PART COMMENT Sumida (847) 956-0666 www.sumida.com CLS62-22022 22 µH Coupled CD43-470 47 µH Murata (404) 436-1300 www.murata.com LQH3C-220 22 µH, 2mm Height Coiltronics (407) 241-7876 www.coiltronics.com CTX20-1 20 µH Coupled, Low DCR Table 2. Capacitor Vendors VENDOR PHONE URL PART COMMENT Taiyo Yuden (408) 573-4150 www.t-yuden.com Ceramic Caps X5R Dielectric AVX (803) 448-9411 www.avxcorp.com Ceramic Caps Tantalum Caps Murata (404) 436-1300 www.murata.com Ceramic Caps Capacitors As described previously, ceramic capacitors can be used with the LT1611 provided loop stability is considered. For lower cost applications, small tantalum units can be used. A value of 22 µF is acceptable, although larger capacitance values can be used. ESR is the most important parameter in selecting an output capacitor. The “flying” capacitor (C2 in the schematic figures) should be a 1 µF ceramic type. An X5R or X7R dielectric should be used to avoid capacitance decreasing severely with applied voltage. The input by- pass capacitor is less critical, and either tantalum or ceramic can be used with little trade-off in circuit perfor- mance. Some capacitor types appropriate for use with the LT1611 are listed in Table 2. Diodes A Schottky diode is recommended for use with the LT1611. The Motorola MBR0520 is a very good choice. Where the input to output voltage differential exceeds 20V, use the MBR0530 ( a 30V diode). If cost is more important than efficiency, a 1N4148 can be used, but only at low current loads. OPERATIO VIN 3.3V –5V 70mA 1611 TA02 SW L1 10 µH D1 D2 GND LT1611 C1, C2: TAIYO YUDEN LMK212BJ105MG C3: TAIYO YUDEN JMK325BJ226MM D1, D2: MBR0520 L1: MURATA LQH3C-100 C1 1 µF C3 22 µF C2 1 µF 10k 29.4k NFB SHDN “Charge Pump” Inverting DC/DC Converter |
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